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Q. J. R. Meteorol. Soc. (2003), 129, pp. 33713389 doi: 10.1256/qj.02.217 Evaluation of moisture in the Hadley Centre climate model using
 

Summary: Q. J. R. Meteorol. Soc. (2003), 129, pp. 33713389 doi: 10.1256/qj.02.217
Evaluation of moisture in the Hadley Centre climate model using
simulations of HIRS water-vapour channel radiances
By RICHARD P. ALLAN1
, M. A. RINGER1
and A. SLINGO2
1
Hadley Centre, Met Of ce, Exeter, UK
2ESSC, University of Reading, UK
(Received 20 November 2002; revised 7 April 2003)
SUMMARY
It is important to establish that climate models can accurately simulate the observed present-day uctuations
of water vapour. In particular, water-vapour and cloud-radiative feedbacks are intrinsically linked to processes
governing relative-humidity distribution and variability. To explore these issues, clear-sky radiances, sensitive to
upper-tropospheric relative humidity, are simulated within the Hadley Centre atmospheric climate model, version
HadAM3, allowing direct comparison with High Resolution Infrared Sounder (HIRS) observations. The model
is forced by observed sea surface temperatures and sea-ice elds over the period 197998. Evaluation of the
simulated distribution and variability of water vapour is undertaken utilizing the HIRS 6.7 m brightness
temperature ( 6 7) and satellite measurements of column-integrated water vapour and clear-sky outgoing long-
wave radiation (OLR). Modi cations are made to the clear-sky OLR and 6 7 HadAM3 diagnostics to reduce

  

Source: Allan, Richard P. - Department of Meteorology, University of Reading

 

Collections: Geosciences